pulsing and putting people off balance

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i thought these two clips were cool in two regards

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the first is a nice way to create a space and keep going in

the second keep a person just a little off balance, etc, long enough to
continue working on him for the k/o--if you happen to be in some clinch close in trouble--which i can't imagine you'd want to stay in very long

https://www.youtube.com/watch?v=H7w2IUJ7jR8&feature=related

https://www.youtube.com/watch?v=GrewiYRi48o